scholarly journals Polyelectrolyte Multilayer Films Based on Natural Polymers: From Fundamentals to Bio-Applications

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2254
Author(s):  
Miryam Criado-Gonzalez ◽  
Carmen Mijangos ◽  
Rebeca Hernández
Keyword(s):  
Molar Mass ◽  
Layer By Layer ◽  
Natural Polymers ◽  
Polyelectrolyte Multilayer ◽  
Precise Control ◽  
Irregular Shapes ◽  
Lbl Assembly ◽  
Several Variables ◽  
Thermal Therapies ◽  
Coating Methods

Natural polymers are of great interest in the biomedical field due to their intrinsic properties such as biodegradability, biocompatibility, and non-toxicity. Layer-by-layer (LbL) assembly of natural polymers is a versatile, simple, efficient, reproducible, and flexible bottom-up technique for the development of nanostructured materials in a controlled manner. The multiple morphological and structural advantages of LbL compared to traditional coating methods (i.e., precise control over the thickness and compositions at the nanoscale, simplicity, versatility, suitability, and flexibility to coat surfaces with irregular shapes and sizes), make LbL one of the most useful techniques for building up advanced multilayer polymer structures for application in several fields, e.g., biomedicine, energy, and optics. This review article collects the main advances concerning multilayer assembly of natural polymers employing the most used LbL techniques (i.e., dipping, spray, and spin coating) leading to multilayer polymer structures and the influence of several variables (i.e., pH, molar mass, and method of preparation) in this LbL assembly process. Finally, the employment of these multilayer biopolymer films as platforms for tissue engineering, drug delivery, and thermal therapies will be discussed.

scholarly journals Surface modification of PEN and PET substrates by plasma treatment and layer-by-layer assembly of polyelectrolyte multilayer thin films and their application in electroless deposition

RSC Advances ◽  
2017 ◽  
Vol 7 (53) ◽  
pp. 33155-33161 ◽  
Author(s):  
T. Tamai ◽  
M. Watanabe ◽  
Y. Kobayashi ◽  
Y. Nakahara ◽  
S. Yajima
Keyword(s):  
Surface Modification ◽  
Plasma Treatment ◽  
Electroless Deposition ◽  
Electroless Nickel ◽  
Multilayer Thin Films ◽  
Layer By Layer ◽  
Polyelectrolyte Multilayer ◽  
Nickel Deposition ◽  
Lbl Assembly ◽  
Electroless Nickel Deposition

Surface modification of PEN and PET substrates by plasma-treatment and LbL assembly of polyelectrolyte multilayers and subsequent electroless nickel deposition.

Nacre-like TiO2 - and ZnO- Based Organic / Inorganic Hybrid Systems

2007 ◽  
Vol 1007 ◽  
Author(s):  
Zaklina Burghard ◽  
Luciana Pitta Bauermann ◽  
Aleksandar Tucic ◽  
Lars P. H. Jeurgens ◽  
Vesna Srot ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Composite Films ◽  
Layer By Layer ◽  
Cross Sectional ◽  
Shear Moduli ◽  
Organic Layers ◽  
Precise Control ◽  
Lbl Assembly ◽  
Sectional Analysis ◽  
Inorganic Layers

ABSTRACTA bioinspired approach combining chemical bath deposition (CVD) of oxides with layer-by-layer (LBL) assembly of organic polymers has been used to prepare two different types of organic/inorganic multilayer composite films, whose morphology resembles that of naturally occurring nacre. Both process steps allow for a precise control of the layer thickness, thus enabling to tailor the architecture of the multilayer composites. The first type of composite films comprised of TiO2 layers, separated by organic interlayer composed of several oppositely charged polyelectrolytes, while the second type of composite films contained ZnO as the inorganic and poly (amino acids) as the organic component. AFM investigations revealed a granular structure of the inorganic layers which originates from the oxide particles. TEM investigation disclosed that the TiO2 particles are amorphous, while the ZnO particles are crystalline. Moreover, TEM cross-sectional analysis of the composite films confirmed the presence of inorganic layers that are well-separated by organic layers, although signatures of partial interpenetration have been observed at the interfaces. The hardness and Young's modulus of both types of composite films, as determined by nanoindentation testing, increased in comparison to the monolithic oxide films. The enhanced mechanical performance underlines the effectiveness of combining layers of different shear moduli into an alternate architecture.

scholarly journals Encapsulation of Phase Change Materials Using Layer-by-Layer Assembled Polyelectrolytes

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Qiangying Yi ◽  
Gleb B. Sukhorokov ◽  
Jin Ma ◽  
Xiaobo Yang ◽  
Zhongwei Gu
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Low Cost ◽  
Sodium Dodecyl ◽  
Layer By Layer ◽  
Latent Heat Storage ◽  
Good Thermal Stability ◽  
Lbl Assembly ◽  
Acid Sodium Salt ◽  
Assembly Technique

Phase change materials absorb the thermal energy when changing their phases (e.g., solid-to-liquid) at constant temperatures to achieve the latent heat storage. The major drawbacks such as limited thermal conductivity and leakage prevent the PCMs from wide application in desired areas. In this work, an environmentally friendly and low cost approach, layer-by-layer (LbL) assembly technique, was applied to build up ultrathin shells to encapsulate the PCMs and therefore to regulate their changes in volume when the phase change occurs. Generally, the oppositely charged strong polyelectrolytes Poly(diallyldimethylammonium chloride) (PDADMAC) and Poly(4-styrenesulfonic acid) sodium salt (PSS) were employed to fabricate multilayer shells on emulsified octadecane droplets using either bovine serum albumin (BSA) or sodium dodecyl sulfate (SDS) as surfactant. Specifically, using BSA as the surfactant, polyelectrolyte encapsulated octadecane spheres in size of ∼500 nm were obtained, with good shell integrity, high octadecane content (91.3% by mass), and good thermal stability after cycles of thermal treatments.

scholarly journals Electrical Field-Assisted Gene Delivery from Polyelectrolyte Multilayers

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 133
Author(s):  
Yu-Che Cheng ◽  
Shu-Lin Guo ◽  
Kun-Da Chung ◽  
Wei-Wen Hu
Keyword(s):  
Gene Delivery ◽  
Electric Field ◽  
Treatment Time ◽  
Transfection Efficiency ◽  
Polyelectrolyte Multilayers ◽  
Aqueous Environment ◽  
Layer By Layer ◽  
Electrical Field ◽  
Lbl Assembly ◽  
Electric Field Treatment

To sustain gene delivery and elongate transgene expression, plasmid DNA and cationic nonviral vectors can be deposited through layer-by-layer (LbL) assembly to form polyelectrolyte multilayers (PEMs). Although these macromolecules can be released for transfection purposes, their entanglement only allows partial delivery. Therefore, how to efficiently deliver immobilized genes from PEMs remains a challenge. In this study, we attempt to facilitate their delivery through the pretreatment of the external electrical field. Multilayers of polyethylenimine (PEI) and DNA were deposited onto conductive polypyrrole (PPy), which were placed in an aqueous environment to examine their release after electric field pretreatment. Only the electric field perpendicular to the substrate with constant voltage efficiently promoted the release of PEI and DNA from PEMs, and the higher potential resulted in the more releases which were enhanced with treatment time. The roughness of PEMs also increased after electric field treatment because the electrical field not only caused electrophoresis of polyelectrolytes and but also allowed electrochemical reaction on the PPy electrode. Finally, the released DNA and PEI were used for transfection. Polyplexes were successfully formed after electric field treatment, and the transfection efficiency was also improved, suggesting that this electric field pretreatment effectively assists gene delivery from PEMs and should be beneficial to regenerative medicine application.

All-nanoparticle layer-by-layer coatings for Mid-IR on-chip gas sensing

2020 ◽  
Vol 56 (91) ◽  
pp. 14283-14286
Author(s):  
Diana Al Husseini ◽  
Junchao Zhou ◽  
Daniel Willhelm ◽  
Trevor Hastings ◽  
Gregory S. Day ◽  
...  
Keyword(s):  
Optical Waveguides ◽  
Gas Sensing ◽  
Layer By Layer ◽  
Precise Control ◽  
Nanoparticle Layer ◽  
Withdrawal Speed ◽  
Layer Deposition ◽  
Nanoparticle Coatings ◽  
On Chip

Functionalization of optical waveguides with submicron all-nanoparticle coatings significantly enhanced the detection of acetone. Such coatings were enabled via precise control of the substrate withdrawal speed using the layer-by-layer deposition.

scholarly journals Fabrication of thermo-regulating cotton fabric with enhanced flame retardancy via layer-by-layer assembly

2021 ◽  
Author(s):  
Yunbo Chen ◽  
Xiangyu Zhu ◽  
Xiang Li ◽  
Bijia Wang ◽  
Zhiping Mao ◽  
...  
Keyword(s):  
Flame Retardancy ◽  
High Performance ◽  
Cotton Fabrics ◽  
Melting Enthalpy ◽  
Residual Carbon ◽  
Layer By Layer ◽  
Scanning Calorimetry ◽  
Infrared Thermal Imaging ◽  
Limiting Oxygen Index ◽  
Lbl Assembly

Abstract The lack of thermo-regulation functionality and high flammability of cotton fabrics greatly restrict their application in high-performance fields. Herein, we report a versatile layer-by-layer (LbL) assembly strategy for introducing to cotton fabrics a multilayered coating consisted of phase change microcapsules and ammonium polyphosphate, endowing them with thermo-regulating and flame retardancy. The coated fabrics were characterized by limiting oxygen index (LOI), scanning electron microscopy (SEM), thermogravimetry (TG), differential scanning calorimetry (DSC) and infrared thermal imaging. The fabric deposited with 20 bilayers (MCPM/APP-20) showed improved flame retardancy with a LOI of 24.4% and residual carbon of 34.24%. It also shows a melting enthalpy of 30.16 J/g, which transferred to a temperature difference of 6.4 ℃ compared with pristine cotton. The functional endowed by the LbL assembly was reasonably durable, with melting enthalpy and residual carbon of MPCM/APP-20 reduced to 17.14 J/g and 19.82% after 30 laundering cycles. These results suggest that LbL assembly was a convenient way for functionalization of cotton fabrics.

scholarly journals Deposition Mechanisms in Layer-by-Layer or Step-by-Step Deposition Methods: From Elastic and Impermeable Films to Soft Membranes with Ion Exchange Properties

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
Marc Michel ◽  
Valérie Toniazzo ◽  
David Ruch ◽  
Vincent Ball
Keyword(s):  
Short Review ◽  
Multilayer Films ◽  
Film Deposition ◽  
Layer By Layer ◽  
Operational Parameters ◽  
Polyelectrolyte Multilayer ◽  
Interacting Species ◽  
Growth Regime ◽  
Versatile Tool ◽  
Solid Liquid

The modification of solid-liquid interfaces with polyelectrolyte multilayer films appears as a versatile tool to confer new functionalities to surfaces in environmentally friendly conditions. Indeed such films are deposited by alternate dipping of the substrates in aqueous solutions containing the interacting species or spraying these solutions on the surface of the substrate. Spin coating is more and more used to produce similar films. The aim of this short review article is to provide an unifying picture about the deposition mechanisms of polyelectrolyte multilayer films. Often those films are described as growing either in a linear or in a supralinear growth regime with the number of deposited “layer pairs”. The growth regime of PEM films can be controlled by operational parameters like the temperature or the ionic strength of the used solutions. The control over the growth regime of the films as a function of the number of deposition steps allows to control their functional properties: either hard and impermeable films in the case of linear growth or soft and permeable films in the case of supralinear growth. Such different properties can be obtained with a given combination of interacting species by changing the operational parameters during the film deposition.

Few durable layers suppress cotton combustion due to the joint combination of layer by layer assembly and UV-curing

RSC Advances ◽  
2015 ◽  
Vol 5 (87) ◽  
pp. 71482-71490 ◽  
Author(s):  
Federico Carosio ◽  
Jenny Alongi
Keyword(s):  
Flame Retardancy ◽  
Uv Curing ◽  
Layer By Layer ◽  
Lbl Assembly ◽  
Layer By Layer Assembly ◽  
Innovative Solutions ◽  
Layer Assembly

In the last five years, Layer by Layer (LbL) assembly has proven to be one of the most innovative solutions for conferring flame retardancy to fabrics.

Electric-field induced layer-by-layer assembly technique with single component for construction of conjugated polymer films

RSC Advances ◽  
2015 ◽  
Vol 5 (72) ◽  
pp. 58499-58503 ◽  
Author(s):  
Shiwei Wang ◽  
Zhuo Chen ◽  
Ahmad Umar ◽  
Yao Wang ◽  
Peng-gang Yin
Keyword(s):  
Electric Field ◽  
Conjugated Polymer ◽  
Multilayer Films ◽  
Single Component ◽  
Layer By Layer ◽  
Lbl Assembly ◽  
Layer By Layer Assembly ◽  
Universal Approach ◽  
Assembly Technique ◽  
Layer Assembly

Single component was used to construct conjugated polymer multilayer films by electric-field induced layer-by-layer assembly technique, which provides a universal approach for CPs and broadens the applicable scope of LBL assembly technique.

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